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sfdlen.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2006 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#include    "sfhdr.h"

/*    Return the length of a double value if coded in a portable format
**
**    Written by Kiem-Phong Vo
*/

#if __STD_C
int _sfdlen(Sfdouble_t v)
#else
int _sfdlen(v)
Sfdouble_t  v;
#endif
{
#define N_ARRAY         (16*sizeof(Sfdouble_t))
      reg int           n, w;
      Sfdouble_t  x;
      int         exp;

      if(v < 0)
            v = -v;

      /* make the magnitude of v < 1 */
      if(v != 0.)
            v = frexpl(v,&exp);
      else  exp = 0;

      for(w = 1; w <= N_ARRAY; ++w)
      {     /* get 2^SF_PRECIS precision at a time */
            n = (int)(x = ldexpl(v,SF_PRECIS));
            v = x-n;
            if(v <= 0.)
                  break;
      }

      return 1 + sfulen(exp) + w;
}

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